can a gen 4 ssd run in a gen 3 capable slot?

Will a Gen4 device work, and how poorly? It was on sale for the same price everywhere Finding an older 4TB device is possible, but maybe

2 slots — supporting both PCIe and — that allow you to expand your system with high-performance SSD storage Designed for the latest generation of NVMe

willis creek slot canyon trailhead photos Kinda odd he spent nearly 4 minutes talking about the difference between Gen 3 and Gen 4

will gen 4 ssd work in gen 3 slot Good idea I think the best idea is to get pcie x 4 if building today